[Retros] Originals from Silvio Baier's article

[Joost de Heer]

All originals are by SB. He tried to show economical representations of 
the Pronkin theme (a piece is captured, and a promoted piece takes its 
place on the homesquare).

Economy criteria used:
- The number of unthematic captures should be minimal (ideally 0)
- The number of moves should be minimal
- The number of officers on their homesquare should be as large as possible

If you have improvements, you can send them to silvio.baier at gmx.de.

Because of the number of compositions (there are almost 40 originals in 
this article!), I've decided to use Xboard to generate a PGN file.

I've already found one (trivial) improvement, while reading:

s: rsbqkbsr/ppp1pppp/8/5B2/4PB2/1Q2P3/PPP2PPP/RS2K1SR (16+15) SPG11.0
(one more piece 'at home')

Joost
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